Related Experiment Video
Updated: Feb 25, 2026
04:31
Taste Preference Assay for Adult Drosophila
Published on: September 8, 2016
10.3K
Taste preference changes throughout different life stages in male rats
Chizuko Inui-Yamamoto1, Takashi Yamamoto2, Katsura Ueda1
1Department of Oral Anatomy, Osaka Dental University, Hirakata, Osaka, Japan.
Plos One
|July 26, 2017
Summary
Aging significantly alters taste preferences in rats, with older rats showing reduced preference for certain tastes and a tendency to favor higher concentrations, indicating decreased taste sensitivity. These changes are likely due to factors beyond the chorda tympani nerve.
Area of Science:
- Gerontology
- Neuroscience
- Sensory Science
Background:
- Taste preference is crucial for food selection and is known to change with aging.
- The specific mechanisms underlying age-related taste preference shifts remain largely unknown.
Purpose of the Study:
- To investigate age-related differences in taste solution preference in Sprague-Dawley rats across various life stages.
- To explore potential correlations between taste preference changes and electrophysiological responses of the chorda tympani nerve.
Main Methods:
- Utilized a two-bottle preference test to assess consumption of sucrose, monosodium glutamate (MSG), quinine hydrochloride (QHCl), hydrochloric acid (HCl), and sodium chloride (NaCl) solutions in rats aged 3 to 72 weeks.
- Recorded electrophysiological responses from the chorda tympani nerve to various taste stimuli to evaluate nerve function across age groups.
Main Results:
- Old-aged rats exhibited lower preference ratios for sucrose and MSG compared to younger groups.
- Middle-aged and old-aged rats showed altered preference ratios for QHCl, with older groups preferring higher concentrations.
- Electrophysiological recordings indicated that aging did not significantly affect the function of the chorda tympani nerve.
Conclusions:
- Aging induces significant alterations in taste preference in rats, independent of chorda tympani nerve function.
- Age-related declines in taste sensitivity may contribute to altered food choices in older individuals.
- The observed changes in taste preference are likely mediated by functional alterations in other sensory pathways, the gastrointestinal system, or the central nervous system.
